Joshua Nelson f3523544f1 Address more review comments
- Add back various diagnostic methods on `Session`.

  It seems unfortunate to duplicate these in so many places, but in the
  meantime, making the API inconsistent between `Session` and `Diagnostic`
  also seems unfortunate.

- Add back TyCtxtAt methods

  These will hopefully be used in the near future.

- Add back `with_const`, it would need to be added soon after anyway.
- Add back `split()` and `get_mut()`, they're useful.
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